Wow, yeah, I've been reading xkcd for years. There aren't many things on the interwebs that hold my attention that long. "Nerd Sniping" is one of my favorites. The earliest comics were clearly mere collegiate doodles- you have to get to comic #200 or so before they get really good. Some of his graphs have been used by major news outlets...
Definitely GEEK humor, so imagine it will go over well here.